Docker usage

#docker   #tutorial  

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Table of Content

Docker usage

Docker usage example from cli and docker-compose

• Run docker set container name and hostname
• Run docker, as none root

Demo

• prebuilt image ubuntu:22.04

cli

docker run -it --rm --name u22 --hostname dev ubuntu:22.04 /bin/bash

root@dev:/#

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docker-compose

docker compose error

docker.credentials.errors.InitializationError: docker-credential-desktop not installed or not available in PATH

edit ~/.docker/config.json Change credsStore to credStore

{
    "stackOrchestrator" : "swarm",
    "experimental" : "disabled",
    "credStore" : "desktop"
}

version: "3"

services:
  demo:
    container_name: my_container_name
    image: ubuntu:22.04
    hostname: dev
    stdin_open: true 
    tty: true

terminal1

docker-compose up

terminal2

docker exec -it py_docker_tutorial_demo_1 /bin/bash

root@dev:/# 

terminal3

docker-compose down

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Demo II

• prebuilt image ubuntu:22.04
• Docker build with user user see note

docker run -it --rm \
--name u22 \
--hostname dev \
--user user \
--workdir /home/user \
ubuntu:22.04 /bin/bash


user@dev:/$

Add user to Dockerfile with sudo support

``` ARG USERNAME=user ARG USER_UID=1000 ARG USER_GID=$USER_UID

Create a non-root user

RUN groupadd –gid $USER_GID $USERNAME
&& useradd -s /bin/bash –uid $USER_UID –gid $USER_GID -m $USERNAME \

[Optional] Add sudo support for the non-root user

&& apt-get update
&& apt-get install -y sudo
&& echo \(USERNAME ALL=\(root\) NOPASSWD:ALL > /etc/sudoers.d/\)USERNAME
&& chmod 0440 /etc/sudoers.d/$USERNAME \

Cleanup

&& rm -rf /var/lib/apt/lists/* ```

```yaml version: “3”

services: demo: container_name: my_container_name image: ubuntu:22.04 hostname: dev stdin_open: true tty: true user: user working_dir: /home/user

```bash title="terminal1"
docker-compose up

terminal2

docker exec -it py_docker_tutorial_demo_1 /bin/bash

user@dev:~$ pwd
/home/user

terminal3

docker-compose down